Magazine et Edition

Volume 31 (2022): Edition 2 (July 2022)

Volume 31 (2022): Edition 1 (March 2022)

Volume 30 (2021): Edition 4 (November 2021)

Volume 30 (2021): Edition 3 (July 2021)

Volume 30 (2021): Edition 2 (May 2021)

Volume 30 (2021): Edition 1 (March 2021)

Volume 29 (2020): Edition 3 (December 2020)

Volume 29 (2020): Edition 2 (August 2020)

Volume 29 (2020): Edition 1 (April 2020)

Volume 28 (2019): Edition 7 (December 2019)

Volume 28 (2019): Edition 6 (August 2019)

Volume 28 (2019): Edition 5 (May 2019)

Volume 28 (2018): Edition 4 (December 2018)

Volume 28 (2018): Edition 3 (October 2018)

Volume 28 (2018): Edition 2 (August 2018)

Volume 28 (2018): Edition 1 (April 2018)

Volume 27 (2017): Edition 8 (December 2017)

Volume 27 (2017): Edition 7 (September 2017)

Volume 27 (2017): Edition 6 (April 2017)

Volume 27 (2017): Edition 5 (January 2017)

Volume 27 (2016): Edition 4 (October 2016)

Volume 27 (2016): Edition 3 (July 2016)

Volume 27 (2016): Edition 2 (April 2016)

Volume 27 (2016): Edition 1 (January 2016)

Volume 26 (2015): Edition 7 (September 2015)

Volume 26 (2015): Edition 6 (June 2015)

Volume 26 (2015): Edition 5 (March 2015)

Volume 26 (2014): Edition 4 (December 2014)

Volume 26 (2014): Edition 3 (September 2014)

Volume 26 (2014): Edition 2 (July 2014)

Volume 26 (2014): Edition 1 (April 2014)

Volume 25 (2013): Edition 8 (December 2013)

Volume 25 (2013): Edition 7 (September 2013)

Volume 25 (2013): Edition 6 (June 2013)

Volume 25 (2013): Edition 5 (March 2013)

Volume 25 (2012): Edition 4 (December 2012)

Volume 25 (2012): Edition 3 (August 2012)

Volume 25 (2012): Edition 2 (June 2012)

Volume 25 (2012): Edition 1 (February 2012)

Volume 24 (2011): Edition 6 (November 2011)

Volume 24 (2011): Edition 5 (May 2011)

Volume 24 (2011): Edition 4 (January 2011)

Volume 24 (2010): Edition 3 (November 2010)

Volume 24 (2010): Edition 2 (July 2010)

Volume 24 (2010): Edition 1 (April 2010)

Volume 23 (2009): Edition 6 (December 2009)

Volume 23 (2009): Edition 5 (September 2009)

Volume 23 (2009): Edition 4 (May 2009)

Volume 23 (2008): Edition 3 (December 2008)

Volume 23 (2008): Edition 2 (August 2008)

Volume 23 (2008): Edition 1 (April 2008)

Volume 22 (2007): Edition 5 (June 2007)

Volume 22 (2007): Edition 4 (January 2007)

Volume 22 (2006): Edition 3 (October 2006)

Volume 22 (2006): Edition 2 (July 2006)

Volume 22 (2006): Edition 1 (April 2006)

Volume 21 (2005): Edition 8 (December 2005)

Volume 21 (2005): Edition 7 (October 2005)

Volume 21 (2005): Edition 6 (July 2005)

Volume 21 (2005): Edition 5 (April 2005)

Volume 21 (2004): Edition 4 (December 2004)

Volume 21 (2004): Edition 3 (October 2004)

Volume 21 (2004): Edition 2 (July 2004)

Volume 21 (2004): Edition 1 (March 2004)

Volume 20 (2003): Edition 8 (December 2003)

Volume 20 (2003): Edition 7 (November 2003)

Volume 20 (2003): Edition 6 (July 2003)

Volume 20 (2003): Edition 5 (March 2003)

Volume 20 (2002): Edition 4 (December 2002)

Volume 20 (2002): Edition 3 (August 2002)

Volume 20 (2002): Edition 2 (June 2002)

Volume 20 (2002): Edition 1 (February 2002)

Volume 19 (2001): Edition 7 (October 2001)

Volume 19 (2001): Edition 6 (July 2001)

Volume 19 (2001): Edition 5 (April 2001)

Volume 19 (2001): Edition 4 (January 2001)

Volume 19 (2000): Edition 3 (October 2000)

Volume 19 (2000): Edition 2 (July 2000)

Volume 19 (2000): Edition 1 (April 2000)

Volume 18 (1999): Edition 6 (December 1999)

Volume 18 (1999): Edition 5 (July 1999)

Volume 18 (1999): Edition 4 (April 1999)

Volume 18 (1998): Edition 3 (December 1998)

Volume 18 (1998): Edition 2 (August 1998)

Volume 18 (1998): Edition 1 (April 1998)

Volume 17 (1997): Edition 3 (December 1997)

Volume 17 (1997): Edition 2 (September 1997)

Volume 17 (1996): Edition 1 (December 1996)

Volume 16 (1995): Edition 4 (November 1995)

Volume 16 (1995): Edition 3 (July 1995)

Volume 16 (1994): Edition 2 (June 1994)

Volume 16 (1994): Edition 1 (May 1994)

Volume 15 (1992): Edition 3 (November 1992)

Volume 15 (1992): Edition 2 (April 1992)

Volume 15 (1991): Edition 1 (August 1991)

Volume 14 (1990): Edition 6 (June 1990)

Volume 14 (1989): Edition 5 (October 1989)

Volume 14 (1989): Edition 4 (February 1989)

Volume 14 (1989): Edition 3 (January 1989)

Volume 14 (1988): Edition 2 (October 1988)

Volume 14 (1987): Edition 1 (December 1987)

Volume 13 (1986): Edition 5 (December 1986)

Volume 13 (1986): Edition 4 (August 1986)

Volume 13 (1986): Edition 3 (July 1986)

Volume 13 (1985): Edition 2 (December 1985)

Volume 13 (1985): Edition 1 (January 1985)

Volume 12 (1984): Edition 5 (November 1984)

Volume 12 (1984): Edition 4 (July 1984)

Volume 12 (1984): Edition 3 (February 1984)

Volume 12 (1983): Edition 2 (June 1983)

Volume 12 (1983): Edition 1 (February 1983)

Volume 11 (1982): Edition 5 (November 1982)

Volume 11 (1982): Edition 4 (August 1982)

Volume 11 (1982): Edition 3 (January 1982)

Volume 11 (1981): Edition 2 (September 1981)

Volume 11 (1981): Edition 1 (March 1981)

Volume 10 (1980): Edition 3 (October 1980)

Volume 10 (1980): Edition 2 (July 1980)

Volume 10 (1979): Edition 1 (December 1979)

Volume 9 (1978): Edition 5 (December 1978)

Volume 9 (1978): Edition 4 (July 1978)

Volume 9 (1977): Edition 3 (October 1977)

Volume 9 (1977): Edition 2 (June 1977)

Volume 9 (1977): Edition 1 (April 1977)

Volume 8 (1976): Edition 7 (October 1976)

Volume 8 (1976): Edition 6 (June 1976)

Volume 8 (1976): Edition 5 (March 1976)

Volume 8 (1975): Edition 4 (December 1975)

Volume 8 (1975): Edition 3 (August 1975)

Volume 8 (1975): Edition 2 (May 1975)

Volume 8 (1975): Edition 1 (January 1975)

Volume 7 (1974): Edition 5 (September 1974)

Volume 7 (1974): Edition 4 (April 1974)

Volume 7 (1973): Edition 3 (November 1973)

Volume 7 (1973): Edition 2 (June 1973)

Volume 7 (1973): Edition 1 (January 1973)

Volume 6 (1972): Edition 5 (October 1972)

Volume 6 (1972): Edition 4 (August 1972)

Volume 6 (1972): Edition 3 (March 1972)

Volume 6 (1971): Edition 2 (September 1971)

Volume 6 (1971): Edition 1 (July 1971)

Volume 5 (1970): Edition 6 (December 1970)

Volume 5 (1970): Edition 5 (November 1970)

Volume 5 (1970): Edition 4 (August 1970)

Volume 5 (1969): Edition 3 (December 1969)

Volume 5 (1969): Edition 2 (August 1969)

Volume 5 (1969): Edition 1 (June 1969)

Volume 4 (1968): Edition 7 (December 1968)

Volume 4 (1968): Edition 6 (November 1968)

Volume 4 (1968): Edition 5 (July 1968)

Volume 4 (1968): Edition 4 (May 1968)

Volume 4 (1968): Edition 3 (February 1968)

Volume 4 (1967): Edition 2 (October 1967)

Volume 4 (1967): Edition 1 (August 1967)

Volume 3 (1966): Edition 9 (December 1966)

Volume 3 (1966): Edition 8 (December 1966)

Volume 3 (1966): Edition 7 (November 1966)

Volume 3 (1966): Edition 6 (September 1966)

Volume 3 (1966): Edition 5 (May 1966)

Volume 3 (1965): Edition 4 (October 1965)

Volume 3 (1965): Edition 3 (August 1965)

Volume 3 (1965): Edition 2 (May 1965)

Volume 3 (1965): Edition 1 (April 1965)

Volume 2 (1964): Edition 7 (November 1964)

Volume 2 (1964): Edition 6 (October 1964)

Volume 2 (1964): Edition 5 (May 1964)

Volume 2 (1964): Edition 4 (February 1964)

Volume 2 (1963): Edition 3 (October 1963)

Volume 2 (1963): Edition 2 (June 1963)

Volume 2 (1963): Edition 1 (March 1963)

Volume 1 (1962): Edition 10 (December 1962)

Volume 1 (1962): Edition 9 (December 1962)

Volume 1 (1962): Edition 8 (November 1962)

Volume 1 (1962): Edition 7 (November 1962)

Volume 1 (1962): Edition 6 (July 1962)

Volume 1 (1962): Edition 5 (February 1962)

Volume 1 (1961): Edition 4 (November 1961)

Volume 1 (1961): Edition 3 (August 1961)

Volume 1 (1961): Edition 2 (May 1961)

Volume 1 (1961): Edition 1 (January 1961)

Détails du magazine
Format
Magazine
eISSN
2719-9509
Première publication
01 Jan 1992
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 5 (1970): Edition 5 (November 1970)

Détails du magazine
Format
Magazine
eISSN
2719-9509
Première publication
01 Jan 1992
Période de publication
4 fois par an
Langues
Anglais

Chercher

8 Articles
Accès libre

Gas Chromatographic Determination of Insecticide Residues in Dried and Fermented Tobacco Samples of Field Trials and Vegetation Studies/Gaschromatographische Bestimmung von Insektizid-Rückständen an getrockneten und fermentierten Tabakproben aus Feld- und Vegetationsversuchen

Publié en ligne: 12 Jul 2014
Pages: 201 - 206

Résumé

Abstract

From the chlorinated hydrocarbons aldrin and heptachlor, applied to the soil for the control of insects, no aldrin or heptachlor could be found in the tobacco leaves. Small quantities of dieldrin (0.01-0.09 ppm) and heptachlor epoxide (0.28-3.5 ppm) were, however, detected. The roots contained remarkable quantities of aldrin and dieldrin, heptachlor I + II + III, and heptachlor epoxide. Other metabolites were not found in tobacco. If lindane was applied to the soil only traces of this insecticide (0.01.-0.16 ppm) were taken up by the tobacco plants and could be identified in the lower and upper leaves. On application after transplanting, aldrin (0.3-3.6 ppm) and heptachlor I + II and heptachlor epoxide (0.1-28 ppm) were found in the middle and top leaves. From the insecticides of organic phosphorous compounds (parathion, metasystox, malathion and bromophos) usually no residues could be found in air-cured tobacco when they were applied 2 weeks before harvesting. On tobacco with high content of resins (dry climate) we found small quantities of organic phosphorous compounds (0.3-5 ppm) if these were applied as dust

Accès libre

Screening Procedures for Organophosphorus, Organochlorine and Carbamate Pesticide Residues on Tobacco

Publié en ligne: 12 Jul 2014
Pages: 207 - 214

Résumé

Abstract

A method has been developed that permits the qualitative and quantitative determination of a number of chlorinated and phosphate insecticide compounds on tobacco. Extraction with acetonitrile, partitioning into petroleum ether, cleanup on a Florisil column are followed by gas chromatography and determination with the microcoulometric system (halogen) and the thermionic detector (phosphorus). A procedure is presented for the extraction and determination of the thiophosphates and water-soluble metabolites remaining in the acetonitrile-water layer after petroleum ether partitioning. Carbamate insecticides are extracted with methylene chloride, partitioned into water, separated by thin-layer chromatography, identified and estimated by colourimetry. Recoveries of the compounds (diazinon, parathion, Guthion, malathion, dimethoate) from tobacco fortified just prior to extraction ranged from 74 to 104 %; DDVP, Dipterex, Metasystox R 50 to 78 %, aldrin, DDT, lindane, thiodan 88 to 101 %, carbaryl, Unden 75 to 82 %, at levels of 0.5 ppm. The results for the field application of these 14 different insecticides on tobacco are presented. They show that there are nil or negligible residues from 8 organophosphorus and 1 carbamate insecticides (Unden); carbaryl and thiodan are well below the legal tolerances. Only the treatment of tobacco with lindane, DDT and aldrin (soil treatment) results in residues above the limit set

Accès libre

Mass Spectrometric and Gas Chromatographic Evidence for Some New Components in the Gas Phase of Tobacco Smoke

Publié en ligne: 12 Jul 2014
Pages: 215 - 219

Résumé

Abstract

The gas phase of fresh tobacco smoke was injected onto an open-tubular gas chromatography column at low temperature. Mass spectra and retention data for components eluted on temperature programming suggest the presence of six new compounds: 1,1-, 1,2-cis-, and 1,2-trans- dimethylcyclopropanes; 1-chloro-5-methylhexane; 1,3,5-hexatriene; and 2-methyl-1-octene

Accès libre

Cigarette Smoke Analysis by Computer - GLC

Publié en ligne: 12 Jul 2014
Pages: 220 - 228

Résumé

Abstract

A two-stage GLC system has been developed to produce a separation of cigarette smoke "semi-volatiles" into several hundred peaks per analysis. Quantitative measurements of the separated peak areas, with correction for baseline drift and an internal standard value, are made by an off-line computer, using a digital output obtained from the GLC system on punched tape. The main features of the computer program used are described, and typical output data are shown. Results of analyses dealing with cigarette smoke composition, and the selective effect of various filters, are presented. The use of neophytadiene as reference compound for the selectivity calculations is described

Accès libre

A New Time-Regulating Mechanism for a Pipe-Smoking Machine

Publié en ligne: 12 Jul 2014
Pages: 229 - 230

Résumé

Abstract

A pipe-smoking machine was constructed which simulates pipe-smoking. A photo-electric cell and a perforated endless belt were used for the time-regulation. The reproducibility of the puff and interval duration was fair: that of the crude and dry condensate of two types of tobacco smoked in this machine requires more investigation

Accès libre

The Effect of Some Humectants on the Properties of a Flue-Cured Tobacco/Die Wirkung einiger Feuchthaltemittel auf die Eigenschaften eines röhrengetrockneten Tabaks

Publié en ligne: 12 Jul 2014
Pages: 231 - 238

Résumé

Abstract

1. The water-vapour transmission of four polyhydric alcohols has been determined for the products themselves as well as after a 3 % application on a flue-cured tobacco type. These polyhydric alcohols are glycerine, sorbitol, propanediol-1,2 and butanediol-1,3. The butanediol-1,3 shows the most hygroscopic properties.

2. Of the four products examined, the same butanediol-1,3 has the strongest fungistatic effect.

3. The taste of the cigarettes with butanediol-1,3 is better than that with sorbitol or propanediol-,1,2 (and diethyleneglycol).

4. The smoke nicotine content of cigarettes, the tobacco of which is treated with 3 % butanediol-1,3 is significantly lower than that of cigarettes out of the same type of tobacco with the other humectants or out of untreated tobacco. This can possibly be caused:

a. Partially by a relatively high moisture equilibrium of the tobacco.

b. Partially by a selective nicotine absorption in the butt (not in the filter).

c. Possibly there is still another effect, because the nicotine totals show a minimum with the glycol cigarettes. However, further experiments were not done.

Accès libre

2nd Collaborative Study of the CORESTA on the Comparability of Three Selected Methods Measuring the Pressure Drop of Filter Rods/Auswertung der 2. CORESTA-Ringuntersuchung über die Vergleichbarkeit von drei ausgewählten Messmethoden für den Zugwiderstand von Filterstäben

Publié en ligne: 12 Jul 2014
Pages: 239 - 252

Résumé

Abstract

Nineteen companies and institutes participated in the second collaborative study, using the measuring methods VA, PA and C in 3 series of filter-rods of 50 pieces each; 4 participants received 3 series and 3 CFO respectively. The differences of the mean values were much smaller than in the first collaborative study and did not exceed 28 mm water. Also the standard deviation of the single values and the standard deviation of reproducibility have decreased to less than half in comparison to the first collaborative study. There was no difference in the method-mean value over all participants and series. Significant differences arose however between the participant-mean values and the mean values as well of the standard deviations of the participants as also of their standard deviations of reproducibility. A regression between the standard deviation of the single values and the standard deviations of reproducibility could however not be shown. Comparing the values of the standard deviation between the samples of the same participants to the values of the residual variance of the single analysis of variance of the series over all participants, it shows that the latter is mostly based on the systematic participant influence. Also a regression between the standard deviation of the single values and the mean values of the pressure drop could not be noticed. An influence of temperature, relative humidity and atmospheric pressure on the value of the pressure drop could only be stated in series III of measuring method C corr. But it was so small that it could practically be neglected. By means of a rank correlation a connection between the mean values of the first and the second collaborative study could be shown for different parameters with most participants. This fact is another proof that the stated differences in pressure drop are mostly based on factors being characteristic for the individual participants. It is to be aimed at the fact that all these factors are checked more thoroughly in order to improve the agreement of the mean values of the pressure drop between the participants

Accès libre

Study on the Filling Differences in Cigarettes/Untersuchung über den fühlbaren Härteunterschied bei Cigaretten

Publié en ligne: 12 Jul 2014
Pages: 253 - 257

Résumé

Abstract

In several lots of cigarette samples the differences in hardness or filling of which had objectively been defined were estimated by a group of experts. The judgement was formed per pair of samples by the criteria ''harder" or ''softer". The part of correct answers was brought into a relation with the hardness or filling difference objectively determined. With the use of a logarithmic scale as basis for the hardness or filling difference, this relation was shown to be linear, which made it possible, based on all results of the experiment, to determine the threshold values of hardness for the capacity of differentiating sensorially. The authors are of the opinion that the described procedure is therefore capable of providing optimum results also in the case of similar problems, if the relation between sensorial judgements and objective measuring values is to be demonstrated

8 Articles
Accès libre

Gas Chromatographic Determination of Insecticide Residues in Dried and Fermented Tobacco Samples of Field Trials and Vegetation Studies/Gaschromatographische Bestimmung von Insektizid-Rückständen an getrockneten und fermentierten Tabakproben aus Feld- und Vegetationsversuchen

Publié en ligne: 12 Jul 2014
Pages: 201 - 206

Résumé

Abstract

From the chlorinated hydrocarbons aldrin and heptachlor, applied to the soil for the control of insects, no aldrin or heptachlor could be found in the tobacco leaves. Small quantities of dieldrin (0.01-0.09 ppm) and heptachlor epoxide (0.28-3.5 ppm) were, however, detected. The roots contained remarkable quantities of aldrin and dieldrin, heptachlor I + II + III, and heptachlor epoxide. Other metabolites were not found in tobacco. If lindane was applied to the soil only traces of this insecticide (0.01.-0.16 ppm) were taken up by the tobacco plants and could be identified in the lower and upper leaves. On application after transplanting, aldrin (0.3-3.6 ppm) and heptachlor I + II and heptachlor epoxide (0.1-28 ppm) were found in the middle and top leaves. From the insecticides of organic phosphorous compounds (parathion, metasystox, malathion and bromophos) usually no residues could be found in air-cured tobacco when they were applied 2 weeks before harvesting. On tobacco with high content of resins (dry climate) we found small quantities of organic phosphorous compounds (0.3-5 ppm) if these were applied as dust

Accès libre

Screening Procedures for Organophosphorus, Organochlorine and Carbamate Pesticide Residues on Tobacco

Publié en ligne: 12 Jul 2014
Pages: 207 - 214

Résumé

Abstract

A method has been developed that permits the qualitative and quantitative determination of a number of chlorinated and phosphate insecticide compounds on tobacco. Extraction with acetonitrile, partitioning into petroleum ether, cleanup on a Florisil column are followed by gas chromatography and determination with the microcoulometric system (halogen) and the thermionic detector (phosphorus). A procedure is presented for the extraction and determination of the thiophosphates and water-soluble metabolites remaining in the acetonitrile-water layer after petroleum ether partitioning. Carbamate insecticides are extracted with methylene chloride, partitioned into water, separated by thin-layer chromatography, identified and estimated by colourimetry. Recoveries of the compounds (diazinon, parathion, Guthion, malathion, dimethoate) from tobacco fortified just prior to extraction ranged from 74 to 104 %; DDVP, Dipterex, Metasystox R 50 to 78 %, aldrin, DDT, lindane, thiodan 88 to 101 %, carbaryl, Unden 75 to 82 %, at levels of 0.5 ppm. The results for the field application of these 14 different insecticides on tobacco are presented. They show that there are nil or negligible residues from 8 organophosphorus and 1 carbamate insecticides (Unden); carbaryl and thiodan are well below the legal tolerances. Only the treatment of tobacco with lindane, DDT and aldrin (soil treatment) results in residues above the limit set

Accès libre

Mass Spectrometric and Gas Chromatographic Evidence for Some New Components in the Gas Phase of Tobacco Smoke

Publié en ligne: 12 Jul 2014
Pages: 215 - 219

Résumé

Abstract

The gas phase of fresh tobacco smoke was injected onto an open-tubular gas chromatography column at low temperature. Mass spectra and retention data for components eluted on temperature programming suggest the presence of six new compounds: 1,1-, 1,2-cis-, and 1,2-trans- dimethylcyclopropanes; 1-chloro-5-methylhexane; 1,3,5-hexatriene; and 2-methyl-1-octene

Accès libre

Cigarette Smoke Analysis by Computer - GLC

Publié en ligne: 12 Jul 2014
Pages: 220 - 228

Résumé

Abstract

A two-stage GLC system has been developed to produce a separation of cigarette smoke "semi-volatiles" into several hundred peaks per analysis. Quantitative measurements of the separated peak areas, with correction for baseline drift and an internal standard value, are made by an off-line computer, using a digital output obtained from the GLC system on punched tape. The main features of the computer program used are described, and typical output data are shown. Results of analyses dealing with cigarette smoke composition, and the selective effect of various filters, are presented. The use of neophytadiene as reference compound for the selectivity calculations is described

Accès libre

A New Time-Regulating Mechanism for a Pipe-Smoking Machine

Publié en ligne: 12 Jul 2014
Pages: 229 - 230

Résumé

Abstract

A pipe-smoking machine was constructed which simulates pipe-smoking. A photo-electric cell and a perforated endless belt were used for the time-regulation. The reproducibility of the puff and interval duration was fair: that of the crude and dry condensate of two types of tobacco smoked in this machine requires more investigation

Accès libre

The Effect of Some Humectants on the Properties of a Flue-Cured Tobacco/Die Wirkung einiger Feuchthaltemittel auf die Eigenschaften eines röhrengetrockneten Tabaks

Publié en ligne: 12 Jul 2014
Pages: 231 - 238

Résumé

Abstract

1. The water-vapour transmission of four polyhydric alcohols has been determined for the products themselves as well as after a 3 % application on a flue-cured tobacco type. These polyhydric alcohols are glycerine, sorbitol, propanediol-1,2 and butanediol-1,3. The butanediol-1,3 shows the most hygroscopic properties.

2. Of the four products examined, the same butanediol-1,3 has the strongest fungistatic effect.

3. The taste of the cigarettes with butanediol-1,3 is better than that with sorbitol or propanediol-,1,2 (and diethyleneglycol).

4. The smoke nicotine content of cigarettes, the tobacco of which is treated with 3 % butanediol-1,3 is significantly lower than that of cigarettes out of the same type of tobacco with the other humectants or out of untreated tobacco. This can possibly be caused:

a. Partially by a relatively high moisture equilibrium of the tobacco.

b. Partially by a selective nicotine absorption in the butt (not in the filter).

c. Possibly there is still another effect, because the nicotine totals show a minimum with the glycol cigarettes. However, further experiments were not done.

Accès libre

2nd Collaborative Study of the CORESTA on the Comparability of Three Selected Methods Measuring the Pressure Drop of Filter Rods/Auswertung der 2. CORESTA-Ringuntersuchung über die Vergleichbarkeit von drei ausgewählten Messmethoden für den Zugwiderstand von Filterstäben

Publié en ligne: 12 Jul 2014
Pages: 239 - 252

Résumé

Abstract

Nineteen companies and institutes participated in the second collaborative study, using the measuring methods VA, PA and C in 3 series of filter-rods of 50 pieces each; 4 participants received 3 series and 3 CFO respectively. The differences of the mean values were much smaller than in the first collaborative study and did not exceed 28 mm water. Also the standard deviation of the single values and the standard deviation of reproducibility have decreased to less than half in comparison to the first collaborative study. There was no difference in the method-mean value over all participants and series. Significant differences arose however between the participant-mean values and the mean values as well of the standard deviations of the participants as also of their standard deviations of reproducibility. A regression between the standard deviation of the single values and the standard deviations of reproducibility could however not be shown. Comparing the values of the standard deviation between the samples of the same participants to the values of the residual variance of the single analysis of variance of the series over all participants, it shows that the latter is mostly based on the systematic participant influence. Also a regression between the standard deviation of the single values and the mean values of the pressure drop could not be noticed. An influence of temperature, relative humidity and atmospheric pressure on the value of the pressure drop could only be stated in series III of measuring method C corr. But it was so small that it could practically be neglected. By means of a rank correlation a connection between the mean values of the first and the second collaborative study could be shown for different parameters with most participants. This fact is another proof that the stated differences in pressure drop are mostly based on factors being characteristic for the individual participants. It is to be aimed at the fact that all these factors are checked more thoroughly in order to improve the agreement of the mean values of the pressure drop between the participants

Accès libre

Study on the Filling Differences in Cigarettes/Untersuchung über den fühlbaren Härteunterschied bei Cigaretten

Publié en ligne: 12 Jul 2014
Pages: 253 - 257

Résumé

Abstract

In several lots of cigarette samples the differences in hardness or filling of which had objectively been defined were estimated by a group of experts. The judgement was formed per pair of samples by the criteria ''harder" or ''softer". The part of correct answers was brought into a relation with the hardness or filling difference objectively determined. With the use of a logarithmic scale as basis for the hardness or filling difference, this relation was shown to be linear, which made it possible, based on all results of the experiment, to determine the threshold values of hardness for the capacity of differentiating sensorially. The authors are of the opinion that the described procedure is therefore capable of providing optimum results also in the case of similar problems, if the relation between sensorial judgements and objective measuring values is to be demonstrated

Planifiez votre conférence à distance avec Sciendo